A deviant odyssey of psychosexual analysis begins as Hall-of-Fame XXX-auteur Rocco Siffredi greets visitors arriving for clinical exploration of their libidos. Built like a battleship, gorgeous blonde MILF Tiffany Rousso meets powerhouse Euro stud Vince Karter, playing a sex therapist. Tiffany, a teacher, relates her story: She’s the object of desire for her male students. She the reveals her private, masturbatory sexual fantasies about two of them. In the fantasy, young studs Nikki Nuttz and Raul Costa jam their pricks in her mouth…